如何使用return / enter键创建UIKeyCommand？

Question

我想制作仅使用UIKeyCommand密钥的[return]。到目前为止，我已经尝试过：

UIKeyCommand *selectCommand = [UIKeyCommand keyCommandWithInput:@"\n" modifierFlags:0 action:@selector(chooseSelection:)];

输入键没有全局常量，例如up，down，left，right和escape（来自UIResponder.h）：

// These are pre-defined constants for use with the input property of UIKeyCommand objects.
UIKIT_EXTERN NSString *const UIKeyInputUpArrow         NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputDownArrow       NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputLeftArrow       NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputRightArrow      NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputEscape          NS_AVAILABLE_IOS(7_0);

还有什么我可以尝试捕获return / enter键吗？

Answer 1

使用@"\r"回车而不是@"\n"换行应该有效。